/* USER CODE BEGIN Header */
/**
 ******************************************************************************
 * @file           : usbd_storage_if.c
 * @version        : v2.0_Cube
 * @brief          : Memory management layer.
 ******************************************************************************
 * @attention
 *
 * Copyright (c) 2025 STMicroelectronics.
 * All rights reserved.
 *
 * This software is licensed under terms that can be found in the LICENSE file
 * in the root directory of this software component.
 * If no LICENSE file comes with this software, it is provided AS-IS.
 *
 ******************************************************************************
 */
/* USER CODE END Header */

/* Includes ------------------------------------------------------------------*/
#include "usbd_storage_if.h"

/* USER CODE BEGIN INCLUDE */
#include "sdio.h"
#include "BSP/SD/sdcard.h"
/* USER CODE END INCLUDE */

/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/

/* USER CODE BEGIN PV */
/* Private variables ---------------------------------------------------------*/

/* 自己定义的一个标记USB状态的寄存器, 方便判断USB状态
 * bit0 : 表示电脑正在向SD卡写入数据
 * bit1 : 表示电脑正从SD卡读出数据
 * bit2 : SD卡写数据错误标志位
 * bit3 : SD卡读数据错误标志位
 * bit4 : 1,表示电脑有轮询操作(表明连接还保持着)
 */
volatile uint8_t g_usb_state_reg = 0;

/* USER CODE END PV */

/** @addtogroup STM32_USB_OTG_DEVICE_LIBRARY
 * @brief Usb device.
 * @{
 */

/** @defgroup USBD_STORAGE
 * @brief Usb mass storage device module
 * @{
 */

/** @defgroup USBD_STORAGE_Private_TypesDefinitions
 * @brief Private types.
 * @{
 */

/* USER CODE BEGIN PRIVATE_TYPES */

/* USER CODE END PRIVATE_TYPES */

/**
 * @}
 */

/** @defgroup USBD_STORAGE_Private_Defines
 * @brief Private defines.
 * @{
 */

#define STORAGE_LUN_NBR 1
#define STORAGE_BLK_NBR 0x10000
#define STORAGE_BLK_SIZ 0x200

/* USER CODE BEGIN PRIVATE_DEFINES */

/* USER CODE END PRIVATE_DEFINES */

/**
 * @}
 */

/** @defgroup USBD_STORAGE_Private_Macros
 * @brief Private macros.
 * @{
 */

/* USER CODE BEGIN PRIVATE_MACRO */

/* USER CODE END PRIVATE_MACRO */

/**
 * @}
 */

/** @defgroup USBD_STORAGE_Private_Variables
 * @brief Private variables.
 * @{
 */

/* USER CODE BEGIN INQUIRY_DATA_FS */
/** USB Mass storage Standard Inquiry Data. */
const int8_t STORAGE_Inquirydata_FS[] = {
    /* 36 */

    /* LUN 0 */
    0x00,
    0x80,
    0x02,
    0x02,
    (STANDARD_INQUIRY_DATA_LEN - 5),
    0x00,
    0x00,
    0x00,
    'S', 'T', 'M', ' ', ' ', ' ', ' ', ' ', /* Manufacturer : 8 bytes */
    'P', 'r', 'o', 'd', 'u', 'c', 't', ' ', /* Product      : 16 Bytes */
    ' ', ' ', ' ', ' ', ' ', ' ', ' ', ' ',
    '0', '.', '0', '1' /* Version      : 4 Bytes */
};
/* USER CODE END INQUIRY_DATA_FS */

/* USER CODE BEGIN PRIVATE_VARIABLES */

/* USER CODE END PRIVATE_VARIABLES */

/**
 * @}
 */

/** @defgroup USBD_STORAGE_Exported_Variables
 * @brief Public variables.
 * @{
 */

extern USBD_HandleTypeDef *hUsbDeviceFS;

/* USER CODE BEGIN EXPORTED_VARIABLES */

/* USER CODE END EXPORTED_VARIABLES */

/**
 * @}
 */

/** @defgroup USBD_STORAGE_Private_FunctionPrototypes
 * @brief Private functions declaration.
 * @{
 */

static int8_t STORAGE_Init_FS(uint8_t lun);
static int8_t STORAGE_GetCapacity_FS(uint8_t lun, uint32_t *block_num, uint16_t *block_size);
static int8_t STORAGE_IsReady_FS(uint8_t lun);
static int8_t STORAGE_IsWriteProtected_FS(uint8_t lun);
static int8_t STORAGE_Read_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len);
static int8_t STORAGE_Write_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len);
static int8_t STORAGE_GetMaxLun_FS(void);

/* USER CODE BEGIN PRIVATE_FUNCTIONS_DECLARATION */

/* USER CODE END PRIVATE_FUNCTIONS_DECLARATION */

/**
 * @}
 */

USBD_StorageTypeDef USBD_Storage_Interface_fops_FS =
    {
        STORAGE_Init_FS,
        STORAGE_GetCapacity_FS,
        STORAGE_IsReady_FS,
        STORAGE_IsWriteProtected_FS,
        STORAGE_Read_FS,
        STORAGE_Write_FS,
        STORAGE_GetMaxLun_FS,
        (int8_t *)STORAGE_Inquirydata_FS};

/* Private functions ---------------------------------------------------------*/
/**
 * @brief  Initializes over USB FS IP
 * @param  lun:
 * @retval USBD_OK if all operations are OK else USBD_FAIL
 */
int8_t STORAGE_Init_FS(uint8_t lun)
{
  /* USER CODE BEGIN 2 */
  return (USBD_OK);
  /* USER CODE END 2 */
}

/**
 * @brief  .
 * @param  lun: .
 * @param  block_num: .
 * @param  block_size: .
 * @retval USBD_OK if all operations are OK else USBD_FAIL
 */
int8_t STORAGE_GetCapacity_FS(uint8_t lun, uint32_t *block_num, uint16_t *block_size)
{
  /* USER CODE BEGIN 3 */
  *block_size = 512;
  *block_num = ((long long)hsd.SdCard.BlockNbr * hsd.SdCard.BlockSize) / 512;
  return (USBD_OK);
  /* USER CODE END 3 */
}

/**
 * @brief  .
 * @param  lun: .
 * @retval USBD_OK if all operations are OK else USBD_FAIL
 */
int8_t STORAGE_IsReady_FS(uint8_t lun)
{
  /* USER CODE BEGIN 4 */
  g_usb_state_reg |= 0X10; /* 标记轮询 */
  return (USBD_OK);
  /* USER CODE END 4 */
}

/**
 * @brief  .
 * @param  lun: .
 * @retval USBD_OK if all operations are OK else USBD_FAIL
 */
int8_t STORAGE_IsWriteProtected_FS(uint8_t lun)
{
  /* USER CODE BEGIN 5 */
  return (USBD_OK);
  /* USER CODE END 5 */
}

/**
 * @brief  .
 * @param  lun: .
 * @retval USBD_OK if all operations are OK else USBD_FAIL
 */
int8_t STORAGE_Read_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len)
{
  /* USER CODE BEGIN 6 */
  g_usb_state_reg |= 0X02; /* 标记正在读数据 */
  sd_read_disk(buf, blk_addr, blk_len);
  return (USBD_OK);
  /* USER CODE END 6 */
}

/**
 * @brief  .
 * @param  lun: .
 * @retval USBD_OK if all operations are OK else USBD_FAIL
 */
int8_t STORAGE_Write_FS(uint8_t lun, uint8_t *buf, uint32_t blk_addr, uint16_t blk_len)
{
  /* USER CODE BEGIN 7 */
  g_usb_state_reg |= 0X01; /* 标记正在写数据 */
  sd_write_disk(buf, blk_addr, blk_len);
  return (USBD_OK);
  /* USER CODE END 7 */
}

/**
 * @brief  .
 * @param  None
 * @retval .
 */
int8_t STORAGE_GetMaxLun_FS(void)
{
  /* USER CODE BEGIN 8 */
  return (STORAGE_LUN_NBR - 1);
  /* USER CODE END 8 */
}

/* USER CODE BEGIN PRIVATE_FUNCTIONS_IMPLEMENTATION */

/* USER CODE END PRIVATE_FUNCTIONS_IMPLEMENTATION */

/**
 * @}
 */

/**
 * @}
 */
